JPS63123725A - Reading device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a reading device, and more particularly, to a reading device equipped with automatic document feeding means.

(Prior Art) FIG. 7 conceptually shows a facsimile reading device.

In this reading device, a plurality of original documents 1 are stacked on a paper mounting table 2, and the leading edges of the original documents 1 are placed on a paper feed roller 3.
and the friction separation plate 4 are pressed into contact with each other. Then, when the paper feed roller 3 is started to rotate, the originals 1 try to be fed together as the paper feed roller 3 rotates, but the originals 1 other than the lowest original 1 are separated by friction. Movement is prevented by plate 4, and only the lowest document 1 is fed. The document 1 thus fed is further conveyed by conveyance rollers 5 and 6, and the document image is read by the reading means 7 during this time. In addition, such a facsimile reading device detects the width of the document 1 (for example, the width of A3 size) and also detects the width of the recipient's rolled recording paper (for example, the width of B4 size) before transmitting the image. The image is automatically reduced according to the width of the recording paper and transmitted. Then, upon completion of recording, the recording paper receives an image signal end signal (for example, CCITT) from the transmitting side.
In the recommended G3 procedure, the signal is cut into a length corresponding to the B4 size, for example, by an EOP, EOM or MPS signal.

(Problems to be Solved by the Invention) By the way, in recent years, facsimile receivers have been using plain paper for recording due to the use of electrophotographic recording technology. The standard paper cassette paper that we are used to using on machines is being replaced. However, in the conventional example, even if the width of the document to be sent can be determined, the length cannot be determined, so for example, if an A4 size document is set horizontally, an error occurs in which the document is determined to be an A3 size document. . Therefore, when communicating with a cassette paper type receiver, A3 cassette paper is selected and the A4 original is printed on half of the A3 recording paper, leaving the remaining half as a blank space, which is extremely wasteful. Furthermore, there is the inconvenience that the user has to cut out the blank space. There is also a method of storing image data once in a memory, but in this case a large capacity memory is required, resulting in an expensive device.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a reading device that can be used in a facsimile machine or the like to eliminate the waste of recording paper from the other party's machine.

[Structure of the invention] (Means for solving problems) In the reading device of the present invention, two sides of the rectangle are Ll.

(1L 1 and (1/2 Ll, Ll) A document mounting table for positioning multiple originals of 28 different sizes with lengths of Ll and Ll in a stacked manner so that the side of Ll is in contact with the paper feed roller. , is placed within a length V-/2L1 from the rear end of the large-sized document placement area of the document placement table, and is placed in the feeding order among the large-sized documents placed on the document placement table. Detects the contact that is brought into pressure contact with the original at the earliest and moves as the original is fed, and whether or not the contact moves, and determines the size of the fed original based on the detection signal. document size determination means.

(Function) In the reading device of the present invention, when originals of two specified sizes, large and small, are stacked on the document mounting table, if the contact moves at the beginning of paper feeding, it is determined that the original is a large-sized original. ,
If the contact does not move, it is determined that the document is of small size.

(Example) FIG. 1 is a diagram conceptually showing a reading device according to the present invention, and FIG. 2 shows the main parts of the device.

This reading device includes an automatic paper feeder 10 that stacks originals P and feeds them one by one, and further transports the originals P fed from the automatic paper feeder 10. It is equipped with a reading means 20 for reading the output image.

The automatic paper feeding means 10 includes a document mounting table 1 installed at an angle.
1, and a paper feed roller 12 and an IIJ friction separation plate 13 that is in contact with the paper feed roller 12 are disposed at the lower end of the document table 11, respectively. As shown in FIG. 2, the document mounting table 11 includes guide plates 14 and 15 for guiding the document P. The guide plates 14 and 15 are installed so as to be movable in the width direction, as shown by the arrows, and one of the guide plates 14 has a tongue piece 14a formed at its tip. Therefore, this tongue piece 14a is attached to the guide plate 1.
Move with 4. Further, a reflective photosensor S1°G2 for detecting the width of the original @P is installed at a position slightly away from the tip of the original platen 11. This sensor S1.82 is installed toward the movement range of the tongue piece 14a,
The moving position of the tongue piece 14a is detected by receiving the reflected light from the tongue piece 14a. These sensors S1.
The output signal of S2 is input to the document size determining section 16, which includes a CPU and the like shown in FIG.

On the other hand, as shown in FIG.
A loading area for A4 size original P.
A roller 17 is arranged outside the mounting area. The roller 17 is supported by a shaft installed below the original plate 11 so as to be perpendicular to the feeding direction of the original IP, and its peripheral surface faces the original plate 11 . Further, above the document placement table 11, a pressing member 18 is arranged to urge the document P on the document placement table 11 toward the roller 17. Therefore, when the original P on the original platen 11 is fed,
The roller 17 is rotated by the frictional force of the original P. Further, a black and white striped pattern 17a is formed on the circumferential surface of the roller 17, and a reflective photosensor S3 is formed near the roller 17 toward the circumferential surface of the roller 17.
is installed. Therefore, when the roller 17 rotates, a pulse signal having a period corresponding to the rotational speed is output from the sensor S3, and this signal is input to the document size determining section 16. - As is clear from FIGS. 2 and 5, when only the sensor S1 receives the reflected light from the tongue piece 14a, the guide plate 14.15 The receiver is set to receive the sensor S1. If neither of the B2 sheets receives the reflected light from the tongue piece 14a, it means that the guide plates 14 and 15 are set so as to receive a 1ff vertical B4 size or horizontal B5 size document P. Further, when only the sensor S2 receives the reflected light from the tongue piece 14a, the guide plates 14, 1
5 is set to accept the original IP of the device A4 size. And sensor S3 is installed vertically A
Since the rotation of the roller 17 is detected only when a 3-size document P and a portrait-oriented B4-size document are placed, it is possible to determine whether the portrait-oriented A3-size or landscape-oriented A4-size document P is placed. , or whether a B4 size document P in portrait orientation or a B5 size document P in landscape orientation is placed can be determined based on the output signal of this sensor S3.

FIG. 4 shows the processing procedure of the document size determining section 16 based on the output signals of the sensors S1, 82 and B3. In this procedure, first, it is determined whether or not the original P is placed on the original m111et table 11 based on the output signal of a sensor (not shown) (step 100). When the document P is placed at the position a, it is determined whether the tongue 14a of the plate 14 is detected by the sensor S1 (step 101). When it is determined that the tongue piece 14a is detected by the sensor S1, the sensor S
Based on the output signal No. 3, it is determined whether or not the O-ra 16 is rotating (step 102). Note that when the roller 17 is rotating, the sensor S3 is
A pulse signal with a predetermined period is output. The document size determining unit 16 uses this pulse signal to trigger a retrigger pull monostable multivibrator having a monostable time longer than the period of the signal, and determines whether or not the roller 17 is rotating from the logic level of the output signal of this multivibrator. are doing. If it is determined that the roller 17 is rotating, the original MP on the document table 11 is of A3 size, and a signal indicating this is output (step 103). Further, if it is determined that the roller 17 is not rotating, since the original MP is landscape A4 size, a signal indicating this is output (step 104). on the other hand,
In step 101, if the tongue piece 14a is not detected, the tongue piece 14a is detected based on the output signal of the sensor S2.
It is determined whether or not a has been detected (step 105).
. If the tongue piece 14a is detected, since the document P on the document table 11 is vertically placed A4 size, a signal indicating this is output (step 106). Also,
In step 105, if the tongue piece 14a is not detected, the roller 1 is detected based on the output signal of the sensor S3.
It is determined whether or not 7 is rotating (step 107).
If it is determined in the same step that the roller 17 is rotating, the document P on the document table 11 is [[ffB4 size, so a signal indicating this is output (step 108). Furthermore, if it is determined in step 107 that the roller 17 is not rotating, the document P is in landscape B5 size, and a signal indicating this is output (step 109).

And each of the above steps 103, 104, 106.10
Each size signal obtained by 8 and 109 is output to the other party's machine, and in the other party's hoe, this signal is used to select the receiving paper. Such judgment processing is performed every time one document P is fed.

On the other hand, the document P fed by the paper feed roller 12 is further conveyed by the conveyance rollers 21 and 22. During this time, the document image on the document P is irradiated by the light source 23, and the K1 image is sent to the sensor 25 through the lens 24. read by.

In the above embodiment, the original stack is a so-called trade-in type automatic paper feeding device that feeds the original documents P on the stand in order from the lowest one, but the present invention is similar to that shown in FIG. It can also be applied to a top-up type automatic paper feeder.

The automatic paper feeding means 10' shown in FIG.
A paper feed roller 12' is disposed above the lower end of the paper feed roller 12', and a friction separation plate 13' is disposed in contact with the lower part of the paper feed roller 12'. Further, in this automatic paper feeding means 10', the roller 17
′ is the same as the roller 17 in the above embodiment, and the sensor S3 is directed toward the circumferential surface of the roller 17′.
is installed. This O-ra 17' is held by a lever 18', and the original loading is carried out on the platform 11 by its own weight.
' is pressed against the IjI paper P on top.

Therefore, in this automatic paper feeding means 10', when the paper feeding roller 12' is rotationally driven, the uppermost original P on the original platen 11' is separated from other originals t%P by the # separation plate 13'. separated and delivered.

At this time, if the length of the original P on the top of the insect is long, it will be rotated by the fed original P, and the rotation operation will be controlled by the sensor S.
It is confirmed based on the output signal of 3.

Of course, in this case as well, the width size of the document P is determined by the sensor S1.
This is confirmed based on the output signal of 82.

In the above embodiment, a facsimile reading device has been described, but the present invention can also be applied to a copying machine.

Further, in the above embodiment, the sensor S1.82 is used to detect the width size of the document P.
3 size and A4 size original MP or B4 size and B
If the reading device handles only 5-size originals P, the sensor S1.82 is not required. That is, in such a case, the guide plate 14.15 is attached to the A3 size document P.
Fixedly install it so that it is set at the '4rIu position, and
It is sufficient to set four sizes of originals P in the @ position. In this case, the roller 17 is moved 1 (210) from the leading edge position of the original P.
1 < 420 darkness). And roller 17
If the document PtfiA3 that is being fed moves.
If the roller 17 is not moved, it may be determined that the size is A4. This is B
The present invention can be similarly applied to a reading device that handles only 4-size and B5-size originals P.

Further, in the above embodiment, the length of the document P that is about to be fed is confirmed by using the roller 17 and detecting the rotation of the roller 17. A block may be installed so as to be slidable, and a sensor may detect when the block moves together with the original P. In other words, the block contacts the original P and moves with the original P when the original P is fed. A sensor may be used to detect the movement of the contact.

Further, the rotation of the roller 17 can also be detected by a tacho generator.

(Effects of the Invention) As described above, in the reading device according to the present invention, the size of the document to be read can be accurately detected regardless of the setting state of the document, so that recording paper such as receiving paper can be appropriately selected. Therefore, waste of recording paper can be avoided.

[Brief explanation of the drawing]

FIG. 1 is a conceptual cross-sectional view of a reading device according to the present invention, and FIG.
The figure is a perspective view showing the automatic paper feeding means of the device, FIG. 3 is a block diagram showing the document size determining means, FIG. 4 is a flowchart showing the processing procedure of the determining means, and FIG. FIG. 6 is a sectional view showing another embodiment of the automatic paper feeding means in the reading device according to the present invention, and FIG. 7 is a diagram showing the setting position of the original size and the installation of the contact. FIG. 7 is a diagram showing the conventional reading device. FIG. 2 is a cross-sectional view conceptually showing. 10...Automatic paper feeding means, 11...Document mounting table, 12
...Paper feed roller, 14.15...Guide plate,
16... Original size discrimination section, 17... Contact, S3
...Sensor. Figure 7

Claims (2)

[Claims] (1) The two sides of the rectangle are L_1, √2L_1 and √2/2
A document mounting table for stacking and positioning a plurality of originals of two sizes, large and small, having lengths L_1 and L_1, with the side of the length L_1 touching the paper feed roller; It is placed within a length √2/2L_1 from the rear edge of the document placement area of the same size, and is pressed against the document with the earliest feeding order among the large size documents placed on the document placement table. A contactor that is moved in accordance with the paper feeding operation, and a document size determining means that detects whether or not the contactor moves and determines the size of the fed document based on the detection signal. A reading device characterized by: (2) The reading device according to claim (1), wherein the contactor is a rotating body.